ADDAC 503 Marble Physics

I was hoping for so much more with this but I don't really understand what it is meant to simulate because it doesn't seem like a marble on a plate to me. Unfortunately, there is no manual except two videos - which are not a substitute for a manual at all. If you want to look something up, how do you do that with a video? Watch the whole thing and hope it is mentioned?
I have a lot of ADDAC modules but this one really not up to their usual quality and the lack of manual is inexcusable.